diff --git a/数据库/MariaDB_Centos7安装mariadb，支持远程访问.md b/数据库/MariaDB/MariaDB_Centos7安装mariadb，支持远程访问.md
similarity index 100%
rename from 数据库/MariaDB_Centos7安装mariadb，支持远程访问.md
rename to 数据库/MariaDB/MariaDB_Centos7安装mariadb，支持远程访问.md
diff --git a/数据库/PostgreSQL_pg_hba.conf.md b/数据库/PostgreSQL/PostgreSQL_hba配置.md
similarity index 100%
rename from 数据库/PostgreSQL_pg_hba.conf.md
rename to 数据库/PostgreSQL/PostgreSQL_hba配置.md
diff --git a/数据库/PostgreSQL_postgresql删除还有活动连接的数据库.md b/数据库/PostgreSQL/PostgreSQL_postgresql删除还有活动连接的数据库.md
similarity index 100%
rename from 数据库/PostgreSQL_postgresql删除还有活动连接的数据库.md
rename to 数据库/PostgreSQL/PostgreSQL_postgresql删除还有活动连接的数据库.md
diff --git a/数据库/PostgreSQL_systemctl start postgresql-12.service     -- 启动服务.md b/数据库/PostgreSQL/PostgreSQL_systemctl start postgresql-12.service     -- 启动服务.md
similarity index 100%
rename from 数据库/PostgreSQL_systemctl start postgresql-12.service     -- 启动服务.md
rename to 数据库/PostgreSQL/PostgreSQL_systemctl start postgresql-12.service     -- 启动服务.md
diff --git a/数据库/PostgreSQL/PostgreSQL删除数据库.md b/数据库/PostgreSQL/PostgreSQL删除数据库.md
new file mode 100755
index 0000000..2ec06b6
--- /dev/null
+++ b/数据库/PostgreSQL/PostgreSQL删除数据库.md
@@ -0,0 +1,7 @@
+```sql
+select `pg_terminate_backend(pid)` from `pg_stat_activity` where `datname`='testdb' and `pid`<>`pg_backend_pid();`
+```
+==上面sql表示的是关闭数据库testdb的活动连接，接下来就可以用==
+```sql
+drop database `testdb;`
+```
\ No newline at end of file
diff --git a/数据库/PostgreSQL_Pg12 安装过程.md b/数据库/PostgreSQL/PostgreSQL安装.md
similarity index 100%
rename from 数据库/PostgreSQL_Pg12 安装过程.md
rename to 数据库/PostgreSQL/PostgreSQL安装.md
diff --git a/数据库/PostgreSQL_Postgresql 帐号密码修改方法.md b/数据库/PostgreSQL/PostgreSQL密码修改.md
similarity index 100%
rename from 数据库/PostgreSQL_Postgresql 帐号密码修改方法.md
rename to 数据库/PostgreSQL/PostgreSQL密码修改.md
diff --git a/数据库/SQL SERVER 游标使用.md b/数据库/SQLServer/SQL SERVER 游标使用.md
similarity index 100%
rename from 数据库/SQL SERVER 游标使用.md
rename to 数据库/SQLServer/SQL SERVER 游标使用.md
diff --git a/数据库/SQLSERVER 数据库恢复挂起的解决办法.md b/数据库/SQLServer/SQLSERVER 数据库恢复挂起的解决办法.md
similarity index 100%
rename from 数据库/SQLSERVER 数据库恢复挂起的解决办法.md
rename to 数据库/SQLServer/SQLSERVER 数据库恢复挂起的解决办法.md
diff --git a/数据库/SQLSERVER存储过程基本语法.md b/数据库/SQLServer/SQLSERVER存储过程基本语法.md
similarity index 100%
rename from 数据库/SQLSERVER存储过程基本语法.md
rename to 数据库/SQLServer/SQLSERVER存储过程基本语法.md
diff --git a/数据库/链接服务器远程查询.md b/数据库/链接服务器远程查询.md
deleted file mode 100755
index 0817502..0000000
--- a/数据库/链接服务器远程查询.md
+++ /dev/null
@@ -1 +0,0 @@
->
\ No newline at end of file
diff --git a/数据库/附加数据库.md b/数据库/附加数据库.md
deleted file mode 100755
index db4f31f..0000000
--- a/数据库/附加数据库.md
+++ /dev/null
@@ -1,3 +0,0 @@
-```sql
-exec sp_attach_single_file_db @dbname='ZHDMTProj_SX',@physname='F:\DataBases\ZHDMTProj_SX.mdf'
-```
\ No newline at end of file